is impure silver can not conduct electricty
Answers
Answer:
Hint:Silver, copper and aluminium are metals. All metals are good conductors of electricity
except some metals like tungsten, bismuth and stainless steel. Pure water is a very good insulator. It
does not contain any impurities that can help in conduction of electrons.
Complete step by step solution:
A solid can behave as conductor, semiconductor or insulator depending on the width of the forbidden energy band gap. A conductor has a high value of electrical conductivity.
This means that the electrons can conduct easily, or can easily travel from the valence band to the
conduction band.
In the case of insulators, the width of the forbidden energy band gap is quite large. It can be from 5 to 15eV. This means that, at least 5 to 15eV is required for an electron to jump from the valence band to the conduction band.
Silver, copper and aluminium are metals and are also conductors. They allow electrons to flow through
them very easily and can conduct electricity. Therefore, they are good conductors of electricity. On the
other hand, pure water is an insulator and cannot conduct electricity. Thus, it is a bad conductor of
electricity.
Hence, option (C) is the correct answer:
Note: Pure water is a bad conductor of electricity and is a very good insulator. This is because pure water does not have any impurity, such as salt dissolved in water. This type of impure water can conduct electricity very well. Tap water is also impure and can also conduct electricity. Aluminium is relatively a poor conductor if compared to copper and silver.